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1.2 COMPUTER AND INFORMATION SCIENCE
Progressive transmission of raster images over the WWW has been successfully applied to provide users with coarser versions of the data before downloading a complete image. In the vector domain, progressive transmission remains a challenging topic. Increasing the level of detail of a vector dataset is a complex process that does not simply imply adding pixels to it. In this paper we present a survey of existing models for progressive transmission of spatial data and discuss open problems and challenges related to the progressive transmission of geographic maps in vector format. Finally, we propose a model based on a client-server architecture and on the pre-computation of multiple map representations that can be used to transmit geographic maps progressively over the WWW.
Carswell, J.: Progressive Transmission of Spatial Data Over the WWW: Challenges. XXXIX Annual Associazione Italiana per l'Informatica ed il Calcolo Automatico (AICA) Congress, Como, Italy, September, 2001.